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9 volt

A PP3 battery, commonly referred to simply as a "nine-volt battery", is shaped as a rounded rectangular prism and has a nominal output of nine volts. Its nominal dimensions are 48 mm × 25 mm × 15 mm (ANSI standard 1604A). It is widely used in smoke detectors, guitar effect units, pocket radios, radio-controlled vehicle controllers, and as backup batteries for digital clocks and alarm clocks. PP3 actually refers to the type of connection or snap that is on top of the battery . The PP3 connector (snap) consists of two connectors: one smaller circular (male) and one larger, typically either hexagonal or octagonal (female). The connectors on the battery are the same as on the connector itself -- the smaller one connects to the larger one and vice versa.